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science say the reef has lost half of its coral cover over the past 27 years. there are multiple causes, including a destructive kind of starfish shown here. we look at what's behind it and what's at stake-- in australia and around the world-- with nancy knowlton, a coral reef biologist and a chair of marine science at the smithsonian national museum of natural history here in washington. welcome. >> thanks. how has all of this coral died off? do we know what's causing it? is it all that... >> it's not all the star fish. the star fish is about 42%. typhoons, big strong storms another 48% and then coral bleaching is the remaining 10% which is caused whenever the water gets too hot. >> ifill: so this is human causedded? >> yes. most of it is human caused. i mean a coral reef naturally goes through cycles of up and down. but it shouldn't be declining by half over course of 27 years. >> ifill: i feel like we have talked before about the declining coral cover. but not... but i'm wondering whether it's now picking up speed or whether this is just a natural deterioration that we should just be
of marine science released a report tuesday saying a number of reeves has gone from 100 to 47 since 1985. experts blame the rapid increase in crown of thornz star fish which eat the coral. they found that ocean warming is a major cause of coral bleaching and prevents the coral from recovering from cyclone damage and they worry that it could halve againy the next decade if current trends continue. >> we believe if we can take action, the crown of thorn star fish, it may leave the reef in a position that can better withstand the climactic impact. >> the great barrier reef extends more than 2,000 kilometers off the coast of northeastern australia and is a world heritage site. >>> a gallery of japanese art has opened at an art museum in melbourne, australia. a ceremony was held on tuesday for the opening of the paulen gander gallery of japanese art named after gandel who donated her collection of japanese art. they performed a japanese ritual to celebrate the opening and the exhibits include a buddhist statue from the 8th to 12th century and a hanging scroll by an 18th century artist. it has
Search Results 0 to 2 of about 3 (some duplicates have been removed)

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